<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<style>
		div{
			width: 100px;
			height: 100px;
			background-color: red;
			margin:10px;
			color: #fff
		}

		div:nth-child(2){
			background: blue;
			position: absolute;
			left: 0px;
			top: 0px;

		}

		article{
			background-color: #ccc;
			width: 500px;
			height: 300px;
			margin:50px;
			position: absolute;
		}
	</style>
</head>
<body>
	<article>
		<div>div1</div>
		<div>div2</div>
		<div>div3</div>
	</article>
</body>
</html>












